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x in (-oo:+oo)
x-((10*x)/100) = 3000 // - 3000
x-((10*x)/100)-3000 = 0
x+(-1/10)*x-3000 = 0
9/10*x-3000 = 0 // + 3000
9/10*x = 3000 // : 9/10
x = 3000/9/10
x = 10000/3
x = 10000/3
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